{"id":"CVE-2026-46556","aliases":["EUVD-2026-46410","GHSA-xq32-9g7q-7297","PYSEC-2026-2479"],"status":"published","title":"FlaskBB: SSRF in get_image_info() via unrestricted avatar URL","description":"FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00354,"percentile":0.29469,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-918"],"published":"2026-05-21T20:42:09Z","modified":"2026-10-28T02:30:54Z","affected":[{"source":"ghsa","ecosystem":"PyPI","package":"flaskbb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.2.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"flaskbb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.2.0"}]}],"versions":["2.0.0","2.0.0.dev0","2.0.1","2.0.2","2.2.0"]},{"source":"osv","ecosystem":"PyPI","package":"flaskbb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.2.0"}]}],"versions":["2.0.0","2.0.0.dev0","2.0.1","2.0.2","2.2.0"]}],"products":[{"vendor":"flaskbb","product":"flaskbb"}],"references":[{"url":"https://github.com/flaskbb/flaskbb/security/advisories/GHSA-xq32-9g7q-7297","tags":["x_refsource_CONFIRM","exploit","advisory","web"]},{"url":"https://github.com/flaskbb/flaskbb/commit/e87e585f54bbe36694e91d52ee9b2d2e65dd4ab5","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/advisories/GHSA-xq32-9g7q-7297","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46556.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46556","tags":["advisory"]},{"url":"https://github.com/flaskbb/flaskbb","tags":["package"]},{"url":"https://pypi.org/project/flaskbb","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-46556","title":"FlaskBB: SSRF in get_image_info() via unrestricted avatar URL","description":"FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.","status":"published","published":"2026-07-21T20:34:23.536Z","modified":"2026-07-22T14:50:37.123Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T13:46:55.086623Z"}],"euvd":[{"id":"EUVD-2026-46410","description":"FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.","status":"published","published":"2026-07-21T20:34:23Z","modified":"2026-07-22T14:50:37Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T18:19:46.391735Z"}],"ghsa":[{"id":"GHSA-xq32-9g7q-7297","title":"FlaskBB: SSRF in get_image_info() via unrestricted avatar URL","description":"###Summary\nA Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services (e.g., AWS 169.254.169.254). This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. CVSS 6.5 Medium.\n\n###Details\nIn flaskbb/utils/helpers.py (line 571), the url parameter is passed directly to requests.get(url, stream=True) without any validation of scheme, host, or IP address.\n```\npython# flaskbb/utils/helpers.py:571\ndef get_image_info(url: str):\n    r = requests.get(url, timeout=(3.05, 27), stream=True)\n```\n\nAttack chain:\n\n```\nPOST /user/settings/user-details (avatar URL)\n→ ValidateAvatarURL.validate()    # validators.py:103\n→ check_image(avatar)             # helpers.py:628\n→ get_image_info(url)             # helpers.py:571\n→ requests.get(url)               # No domain/IP restriction\nEntry points:\n\n/user/settings/user-details (any authenticated user)\n/admin/users/\u003cid\u003e/edit (admin only)\n\n```\n\n###PoC\n[submit.zip](https://github.com/user-attachments/files/26301527/submit.zip)\n\nLog in to FlaskBB as any user\nNavigate to Settings → User Details\nEnter http://169.254.169.254/latest/meta-data/ as the avatar URL\nSubmit the form\nThe server sends a GET request to the internal metadata endpoint\n\nThree exploitation channels confirmed:\n\nServer-side request: Captured on mock metadata server\nInternal port scan: check_image() returns distinct errors (CONN_REFUSED, NO_CONTENT_LENGTH, TYPE_NOT_ALLOWED, SUCCESS) that map internal network topology\nInternal API triggering: Mock APIs on 127.0.0.1:9200 triggered via SSRF (deploy, shutdown, key dump endpoints)\n\n###Impact\nAny authenticated user is impacted. Attackers can force the server to request internal services, cloud metadata endpoints, or private network resources. On cloud deployments (AWS/GCP/Azure), IAM credentials can be leaked. In production, any GET-triggered internal service is reachable: CI/CD webhooks, Elasticsearch, etcd, Consul, etc.","status":"published","published":"2026-05-21T20:42:09Z","modified":"2026-05-21T20:42:10Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:40:13.628377Z"}],"nvd":[{"id":"CVE-2026-46556","description":"FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.","status":"published","published":"2026-07-21T21:16:50.133Z","modified":"2026-07-23T16:04:11.74Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:12:31.394335Z"}],"osv":[{"id":"CVE-2026-46556","title":"FlaskBB: SSRF in get_image_info() via unrestricted avatar URL","description":"FlaskBB is a Forum Software written in Python using the micro framework Flask. Prior to version 2.2.1, a Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. Version 2.2.1 patches the issue.","status":"published","published":"2026-07-21T20:34:23.536Z","modified":"2026-10-28T02:30:54.791961802Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:45:05.870292Z"},{"id":"GHSA-xq32-9g7q-7297","title":"FlaskBB: SSRF in get_image_info() via unrestricted avatar URL","description":"###Summary\nA Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services (e.g., AWS 169.254.169.254). This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. CVSS 6.5 Medium.\n\n###Details\nIn flaskbb/utils/helpers.py (line 571), the url parameter is passed directly to requests.get(url, stream=True) without any validation of scheme, host, or IP address.\n```\npython# flaskbb/utils/helpers.py:571\ndef get_image_info(url: str):\n    r = requests.get(url, timeout=(3.05, 27), stream=True)\n```\n\nAttack chain:\n\n```\nPOST /user/settings/user-details (avatar URL)\n→ ValidateAvatarURL.validate()    # validators.py:103\n→ check_image(avatar)             # helpers.py:628\n→ get_image_info(url)             # helpers.py:571\n→ requests.get(url)               # No domain/IP restriction\nEntry points:\n\n/user/settings/user-details (any authenticated user)\n/admin/users/\u003cid\u003e/edit (admin only)\n\n```\n\n###PoC\n[submit.zip](https://github.com/user-attachments/files/26301527/submit.zip)\n\nLog in to FlaskBB as any user\nNavigate to Settings → User Details\nEnter http://169.254.169.254/latest/meta-data/ as the avatar URL\nSubmit the form\nThe server sends a GET request to the internal metadata endpoint\n\nThree exploitation channels confirmed:\n\nServer-side request: Captured on mock metadata server\nInternal port scan: check_image() returns distinct errors (CONN_REFUSED, NO_CONTENT_LENGTH, TYPE_NOT_ALLOWED, SUCCESS) that map internal network topology\nInternal API triggering: Mock APIs on 127.0.0.1:9200 triggered via SSRF (deploy, shutdown, key dump endpoints)\n\n###Impact\nAny authenticated user is impacted. Attackers can force the server to request internal services, cloud metadata endpoints, or private network resources. On cloud deployments (AWS/GCP/Azure), IAM credentials can be leaked. In production, any GET-triggered internal service is reachable: CI/CD webhooks, Elasticsearch, etcd, Consul, etc.","status":"published","published":"2026-05-21T20:42:09Z","modified":"2026-07-13T16:42:35.76356408Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:47:00.198893Z"},{"id":"PYSEC-2026-2479","title":"FlaskBB: SSRF in get_image_info() via unrestricted avatar URL","description":"###Summary\nA Server-Side Request Forgery (SSRF) vulnerability in get_image_info() allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services (e.g., AWS 169.254.169.254). This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities. CVSS 6.5 Medium.\n\n###Details\nIn flaskbb/utils/helpers.py (line 571), the url parameter is passed directly to requests.get(url, stream=True) without any validation of scheme, host, or IP address.\n```\npython# flaskbb/utils/helpers.py:571\ndef get_image_info(url: str):\n    r = requests.get(url, timeout=(3.05, 27), stream=True)\n```\n\nAttack chain:\n\n```\nPOST /user/settings/user-details (avatar URL)\n→ ValidateAvatarURL.validate()    # validators.py:103\n→ check_image(avatar)             # helpers.py:628\n→ get_image_info(url)             # helpers.py:571\n→ requests.get(url)               # No domain/IP restriction\nEntry points:\n\n/user/settings/user-details (any authenticated user)\n/admin/users/\u003cid\u003e/edit (admin only)\n\n```\n\n###PoC\n[submit.zip](https://github.com/user-attachments/files/26301527/submit.zip)\n\nLog in to FlaskBB as any user\nNavigate to Settings → User Details\nEnter http://169.254.169.254/latest/meta-data/ as the avatar URL\nSubmit the form\nThe server sends a GET request to the internal metadata endpoint\n\nThree exploitation channels confirmed:\n\nServer-side request: Captured on mock metadata server\nInternal port scan: check_image() returns distinct errors (CONN_REFUSED, NO_CONTENT_LENGTH, TYPE_NOT_ALLOWED, SUCCESS) that map internal network topology\nInternal API triggering: Mock APIs on 127.0.0.1:9200 triggered via SSRF (deploy, shutdown, key dump endpoints)\n\n###Impact\nAny authenticated user is impacted. Attackers can force the server to request internal services, cloud metadata endpoints, or private network resources. On cloud deployments (AWS/GCP/Azure), IAM credentials can be leaked. In production, any GET-triggered internal service is reachable: CI/CD webhooks, Elasticsearch, etcd, Consul, etc.","status":"published","published":"2026-07-13T15:19:10.820662Z","modified":"2026-07-13T16:31:46.478606305Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:55.961245Z"}]}}